International Congress on Surface Active Substances, 5th Barcelona, 1968. (1969). Chimie, physique et applications pratique des agents de surface: Compte-rendu du Veme Congres International de la Detergence,Barcelone, 9 au 13 septembre 1968. Chemistry, physics and practical applications of surface active substances; proceedings of the Vth International Congress on surface active substances. Ediciones Unidas.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Congress on Surface Active Substances, 5th Barcelona, 1968. Chimie, Physique Et Applications Pratique Des Agents De Surface: Compte-rendu Du Veme Congres International De La Detergence,Barcelone, 9 Au 13 Septembre 1968. Chemistry, Physics and Practical Applications of Surface Active Substances; Proceedings of the Vth International Congress on Surface Active Substances. Barcelona: Ediciones Unidas, 1969.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Congress on Surface Active Substances, 5th Barcelona, 1968. Chimie, Physique Et Applications Pratique Des Agents De Surface: Compte-rendu Du Veme Congres International De La Detergence,Barcelone, 9 Au 13 Septembre 1968. Chemistry, Physics and Practical Applications of Surface Active Substances; Proceedings of the Vth International Congress on Surface Active Substances. Ediciones Unidas, 1969.